Spectroscopy in the extreme ultraviolet on an electron beam ion trap
- Department of Physics and Space Technology, Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
A compact grazing-incidence spectrometer was implemented on the Livermore electron beam ion trap facility for spectral measurements in the extreme ultraviolet spectral region. The spectrometer employed a 1200 scr(l)/mm grating designed for flat-field focusing and a charge coupled device camera for readout. The instrument was used to measure line emission in the range from 25 to 220 {Angstrom} with a resolving power as high as 600. The performance and calibration of the instrument is described and spectra from highly charged nitrogen and iron ions are presented. Measurements of the {ital K}-shell spectrum of He-like N{sup 5+} are presented that confirm earlier wavelength determinations and illustrate the accuracy achievable with the instrument. Our measurement suggests a change in the line identifications of the forbidden He-like N{sup 5+} transition 1s2sthinsp{sup 3}S{sub 1}{r_arrow}1s{sup 2}thinsp{sup 1}S{sub 0} and of the Li-like N{sup 4+} collisional satellite transition 1s2s2pthinsp{sup 2}P{sub 3/2}{r_arrow}1s{sup 2}2sthinsp{sup 2}S{sub 1/2} observed on the Alcator C-Mod tokamak. {copyright} {ital 1999 American Institute of Physics.}
- OSTI ID:
- 295606
- Report Number(s):
- CONF-980605-; ISSN 0034-6748; TRN: 99:001792
- Journal Information:
- Review of Scientific Instruments, Vol. 70, Issue 1; Conference: 12. topical conference on high-temperature plasma diagnostics, Princeton, NJ (United States), 7-11 Jun 1998; Other Information: PBD: Jan 1999
- Country of Publication:
- United States
- Language:
- English
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